bellowing vs shout

bellowing and shout both are nouns.

Word	Noun	Adjective	Verb	Adverb
bellowing	Yes	No	No	No
shout	Yes	No	Yes	No

As nouns, shout is a hypernym of bellowing; that is, shout is a word with a broader meaning than bellowing:

Other hypernyms of bellowing include call, cry, outcry, vociferation, yell.

bellowing (noun)	shout (noun)
a very loud utterance (like the sound of an animal)	a loud utterance; often in protest or opposition

bellowing (verb)	shout (verb)
	utter in a loud voice; talk in a loud voice (usually denoting characteristic manner of speaking)
	utter a sudden loud cry
	utter aloud; often with surprise, horror, or joy
	use foul or abusive language towards